Bespoke software, built byengineers who've done it at scale.
FlintLark designs and ships production software for funded startups, regulated enterprises, and ambitious SMBs. The team has contributed to Checkout.com's payment interfaces, BT Group's developer platform, and Uphold's digital money infrastructure — and now ships those same standards to your roadmap.
- Next.js · FastAPI · Spring Boot · Kubernetes
- $100M+ in production
- PCI DSS shipped
- Dubai · London
Engineering that has shipped at scale
Most software gets built twice.
Once by the cheapest team that could be found. Then again, eighteen months later, when the platform hits a wall, the architecture won't scale, and the founding engineer has moved on. We are the team you hire when you'd rather build it properly the first time. That doesn't mean slower or more expensive — it means decisions today that don't blow up in year two.
Decisions that survive year two
Architecture choices reviewed against the next two years of growth, not the next sprint. Where it matters, documented for the next engineer.
Tests, observability, runbooks
Not just code that works. Code that you can monitor, deploy with confidence, and hand over without anxiety. Year-two problems caught year-one.
Clean handovers, no lock-in
Source code, infrastructure, documentation, runbooks — yours from milestone one. We win repeat work on quality, not on hostage clauses.
Software work we take on.
Four engagement shapes. All shipped to production for paying clients.
New product builds (MVP to scale)
Greenfield web platforms, mobile apps, and APIs. Architected to ship fast, but also to survive Series-B traffic and a second engineering hire.
Platform modernisation
Legacy systems migrated to modern stacks without losing two years to a re-platform. Strangler-fig migrations, gradual cutovers, real users tested at every step.
Mobile apps
Native iOS and Android, React Native, Flutter. From MVP to App Store launch — including push, offline sync, payments, and the AI capabilities that make modern apps useful.
Specialised platforms
PCI DSS-grade payments, insurance underwriting platforms, multi-tenant SaaS, regulated industry tooling. The work that requires senior-level care.
The engagement, end to end.
Five steps. Senior engineers all the way through. No bait-and-switch to junior teams.
Scope call (free)
Free 30-minute scoping call and written summary. We tell you in the first call whether we are the right team.
Discovery sprint
2–4 weeks, paid. Architecture, designs, build spec, fixed-price proposal for the full build. Output is yours to keep.
Build
8–24 weeks. Weekly demos. Production-ready code from sprint one. CI from day one, not week eight.
Launch & hardening
Load tests, security audit, observability, runbooks. The phase most agencies skip and the one that decides whether the platform stays live.
What we've shipped.
Payment Interfaces — Checkout.com
Powering Netflix · ASOS · Uber Eats · 50,000+ merchants
$100M+ processed · PCI DSS · Globally deployed
Core contributor to Payment Links, Hosted Payments Pages, and the Frames SDK — used by Netflix, ASOS, Uber Eats, and 50,000+ merchants globally. Built accessible, PCI-compliant checkout experiences at scale, with ML-driven fraud scoring and conversion optimisation.
BT Group — Internal Developer Platform
Platform engineering at telecom scale
Self-service service launches in minutes
Platform engineering for one of the world's leading telecoms. Internal developer portals with Port.io, Kubernetes-based service templates on AWS, CI/CD pipelines, Dynatrace observability, and self-service infrastructure tooling.
DealHabibi — UAE Deals Platform
Community-driven commerce, end-to-end
Built in 60 days · 500+ retailers · Live for Ramadan 2026
A community platform where UAE shoppers discover deals, share buying experiences, compare prices, and vote on the best offers across 500+ retailers. Affiliate integration with Amazon.ae and Noon, real-time deal submission with URL scraping, content moderation for UAE compliance.
Tech we ship on — chosen for engineering reasons.
Stack-pragmatic. We will write Vue or Angular if your codebase needs it. We will not take on COBOL maintenance.
Frontend
Next.js · React · Angular · Vue · TypeScript · Tailwind · React Native
Backend
FastAPI · Django · Spring Boot · Quarkus · NestJS · Node · gRPC · GraphQL
Cloud & DevOps
AWS · GCP · Azure · Kubernetes · Terraform · Vercel · Cloudflare
Data & Payments
PostgreSQL · MongoDB · Redis · Elasticsearch · Stripe · Checkout.com · PCI DSS
Four reasons clients pick us.
Senior engineers, not seat-fillers
Every engagement is led by someone who has shipped at Checkout.com, BT, a Lloyd's syndicate, or all three. No junior-led delivery.
AI-fluent by default
We ship AI in production, not in slides. 15+ LLMs live in our work today, with eval harnesses and guardrails as table stakes.
Flexible delivery
Embedded partner when you need a team. Single principal when you need surgery. We scale up and down to match the work.
Outcome-clear pricing
Discovery sprints are fixed-price. Builds are milestone-based. No hourly games, no surprise change orders, no lock-in.
How engagements price.
Discovery Sprint
Architecture, designs, build plan, fixed-price proposal. The output is yours to keep — even if the build goes to someone else.
Scope a sprintFull Build
End-to-end product or platform build. Weekly demos, sprint reviews, hardening, security audit, handover. Most builds land between $50k–$320k.
Talk through a buildEmbedded Engineering
Ongoing engineering ownership for clients who need senior eyes on the codebase. Architecture, code review, mentoring, feature work.
Discuss a retainerAll figures starting points. Final scope and price set in discovery.
Common questions.
We are smaller, faster, and you talk to the people writing the code. Big consultancies sell a hundred-page proposal and deliver via offshore junior teams. We deliver senior engineering directly. Our pricing is competitive for that calibre — we do not pretend to be cheap.
Primary: Next.js, React, FastAPI, NestJS, Spring Boot, Kubernetes, PostgreSQL, AWS, GCP. We are stack-pragmatic — we will write Vue or Angular if that is what your codebase needs. We will not take on COBOL maintenance.
We have a design partner network — Figma-fluent, product-design-trained — and we co-deliver. We don't pretend to be a design studio, but we don't ship engineering-driven UI either.
Yes. We do this often. Week one is an audit: dependency hygiene, test coverage, architecture map, security review, hotspots. You get a written report and a remediation plan before we touch anything.
Always. Standard for every engagement. All IP transfers to the client on payment of each milestone.
Below $25,000, you are better served by a senior contractor than by an agency. We do not take work we cannot ship properly.
Dubai HQ, frequent London. We take clients across the UAE, UK, US, and EU. Async-first by default. On-site for kick-offs and critical sprints when it matters.
Ready to build it properly?
Tell us what you need. The first call is free, the discovery sprint is paid, and the proposal you get back is detailed enough to be useful even if you choose someone else.
Typical reply: within 1 business day · EMEA business hours · petar@flintlark.com